U.S. Army Counter Rocket, Artillery, and Mortar (CRAM) Gun Test Fire. The Northrop Grumman Counter-Rocket, Artillery, and Mortar (C-RAM) is the latest innovation for defending troops from aerial attacks. Counter Rocket, Artillery, and Mortar (C-RAM or CRAM) or Land-based Phalanx Weapon System (LPWS), is a set of systems used to detect …